Brazing fin material for heat exchangers, heat exchanger, and method of manufacturing same
View Patent ↗A brazing fin material for heat exchangers includes a core material and a filler metal clad on each side of the core material, wherein the core material is an aluminum alloy including manganese, the filler metal is an aluminum alloy including 6 to 9.5 mass % of silicon, silicon particles in the filler metal have an average circle equivalent diameter of 3 μm or less, and the brazing fin material has a thickness of 0.06 mm or less.
1. A brazing fin material for heat exchangers comprising:
a core material: and
a filler metal clad on each side of the core material, wherein the core material being an aluminum alloy including manganese, the filler metal being an aluminum alloy including 6 to 9.5 mass % of silicon, silicon particles in the filler metal having an average circle equivalent diameter of 3 μm or less, and the brazing fin material having a thickness of 0.06 mm or less.
2. The brazing fin material for heat exchangers according to claim 1 , wherein:
the core material is an aluminum alloy including 1.0 to 1.8 mass % of manganese, 0.3 to 1.0 mass % of silicon, 0.05 to 0.3 mass % of iron, and 1.0 to 3.0 mass % of zinc, and the filler metal is an aluminum alloy including (a) 6 to 9.5 mass % of silicon and (b) one or two or more of 0.01 to 0.03 mass % of strontium, 0.001 to 0.02 mass % of sodium, and 0.05 to 0.4 mass % of antimony.
3. The brazing fin material for heat exchangers according to claim 2 , wherein the core material further includes one or two or more of 0.05 to 0.3 mass % of chromium, 0.05 to 0.3 mass % of titanium, and 0.05 to 0.3 mass % of zirconium.
4. The brazing fin material for heat exchangers according to claim 3 , wherein the silicon particles in the filler metal have a circle equivalent diameter of 20 μm or less and a value (μ+3σ) of 15 μm or less.
5. A heat exchanger obtained by corrugating the brazing fin material for heat exchangers according to claim 4 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes.
6. A heat exchanger obtained by corrugating the brazing fin material for heat exchangers according to claim 3 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes.
7. A method of manufacturing a heat exchanger comprising corrugating the brazing fin material for heat exchangers according to claim 3 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes to obtain a heat exchanger.
8. A method of manufacturing a heat exchanger comprising corrugating the brazing fin material for heat exchangers according to claim 4 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where a heating time in a temperature region of 450° C. or more is 3 to 10 minutes to obtain a heat exchanger.
9. The brazing fin material for heat exchangers according to claim 2 , wherein the silicon particles in the filler metal have a circle equivalent diameter of 20 μm or less and a value (μ+3σ) of 15 μm or less.
10. A heat exchanger obtained by corrugating the brazing fin material for heat exchangers according to claim 9 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes.
11. A method of manufacturing a heat exchanger comprising corrugating the brazing fin material for heat exchangers according to claim 9 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes to obtain a heat exchanger.
12. A heat exchanger obtained by corrugating the brazing fin material for heat exchangers according to claim 2 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes.
13. A method of manufacturing a heat exchanger comprising corrugating the brazing fin material for heat exchangers according to claim 2 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes to obtain a heat exchanger.
14. The brazing fin material for heat exchangers according to claim 1 , wherein the silicon particles in the filler metal have a circle equivalent diameter of 20 μm or less and a value (μ+3σ) of 15 μm or less.
15. A heat exchanger obtained by corrugating the brazing fin material for heat exchangers according to claim 14 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes.
16. A method of manufacturing a heat exchanger comprising corrugating the brazing fin material for heat exchangers according to claim 14 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes to obtain a heat exchanger.
17. A heat exchanger obtained by corrugating the brazing fin material for heat exchangers according to claim 1 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes.
18. The heat exchanger according to any one of claims 17 to 5 , wherein the aluminum grain size in the core material after brazing is 100 μm or more.
19. A method of manufacturing a heat exchanger comprising corrugating the brazing fin material for heat exchangers according to claim 1 to obtain a corrugated brazing fin material, assembling the corrugated brazing fin material, a working fluid passage material, and a header, and brazing the assembled product under conditions where the heating time in a temperature region of 450° C. or more is 3 to 10 minutes to obtain a heat exchanger.